Over the years it has been my observation that oil changes (of the same exact type) result in less MPG early on. Then as the oil milage increases, the MPG gets back up to normal for each car. Then it stabilizes for the remainder of the oil run.
If so (I'd like to see the controlled procedure to verify the claim), it could be from more friction right after an oil change due to the new oil stripping the old triofilm which then has to be built back up as the new oil gets miles put on it. Talked about in this thread linked below. Edit - someone beat me to it, so more than one thinking along these lines.
They've been around, but I think the newest ones use both variable vane and a clutch. They had clutchless for a while so then the AC would be always on, at about 10% of maximum capacity.
They've been around, but I think the newest ones use both variable vane and a clutch. They had clutchless for a while so then the AC would be always on, at about 10% of maximum capacity.
Sure there are now "variable displacement" AC compressors, but in today's constant drive to obtain better fuel mileage I'd think the compressor could still be totally turned off/deactivated by the driver is desired.
Sure there are now "variable displacement" AC compressors, but in today's constant drive to obtain better fuel mileage I'd think the compressor could still be totally turned off/deactivated by the driver is desired.